@shahabrk
Thermostat valve is present in my vehicle.I dont use direct fan.Have no issues of heatup.Remove thermostat valve only if its not fuctioning properly and the engine heat up issue has reached its peak.(Weak engine consuming large quantity of oil) or poor condition of cooling system.In case of all problems,the direct fan should be for short period and vehicle original engine status should be maintained as soon as possible for better economy & performance of vehicle.
For upgarde,perform some of these:-
1. Remove all mechanical parts and paint vehicle from excellent repo dentor/painter having baked paint
facility
2. Replace wiring of vehicle if carrying too many joints.
3. Change Rear suspension spring and shocks if required.
4. Change complete front suspension(including tyrod ends,ball joints,front shocks with springs if required,d-Bush if required)
5. Check axle
6. Service display meter and install high output bulbs.
7. Install stock rims or checked alloys 13'' for this vehicle with new tyres having 175/70 R13 size.
8. Check & clean all sensors.
9. Service A/C vibrator and condensor
10.Service radiator
11. Install extra AC fan with cutout.
12. Install cutouts for head lights with kyoto original halogens
13. Clean head lights & seal glass and body of headlight area with silicone.If chrome damaged then get them chromed or install new headlights.
14. Check door joits for play and if so replace it.
15. Replace complete distributor parts(Rotor,Coil,Seal)
16. Complete engine overhaul(Timing belt,timing seals,valves,Piston rings,oil pump service or replace if required,replace water body if sluggish movement of internal bearing,damaged/rusted fins,Bore engine block if required,replace generator & a/c belts)
NOTE:-You can also change your engine head to TWINCAM or DOHC 16 valve as testdriver has done---need to be bought from second hand market.
17. Generator service with replacement of both bearings
18. Replace new spark plugs,airfilter,feul filter & oil filter with genuine parts.
19. Refill water reservoir & radiator with 4 bottles of coolant and add water to refill rest of space.
20. Use Caltex Havoline Formula(black One) for engine oil and replace oil every 4500km.Replace oil every secong oil change i.e 9000km.
21. Check and service/lubricate front and rear brake system with disc pads and leathers.If disc pads or leathers worn out then replace with original.
22. Balancing & alignment from qualified person having experience of Daewoo racer.
23. Change battery to Exide 80L or FB 80L
24. Replace gear box from second hand market with trading your old one.remeber to buy from reliable person there with check warranty for few days.